// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef GIN_MODULES_FILE_MODULE_PROVIDER_H_
#define GIN_MODULES_FILE_MODULE_PROVIDER_H_

#include <set>
#include <string>
#include <vector>

#include "base/files/file_path.h"
#include "gin/gin_export.h"
#include "gin/runner.h"

namespace gin {

// FileModuleProvider knows how to load AMD modules off disk. It searches for
// modules in the directories indiciated by |search_paths|. Although we still
// read from the file system on the main thread, we'll eventually want to move
// the reads to a background thread.
class GIN_EXPORT FileModuleProvider {
public:
    explicit FileModuleProvider(
        const std::vector<base::FilePath>& search_paths);
    ~FileModuleProvider();

    // Searches for modules with |ids| in the file system. If found, the modules
    // will be executed asynchronously by |runner|.
    void AttempToLoadModules(Runner* runner, const std::set<std::string>& ids);

private:
    std::vector<base::FilePath> search_paths_;

    // We'll only search for a given module once. We remember the set of modules
    // we've already looked for in |attempted_ids_|.
    std::set<std::string> attempted_ids_;

    DISALLOW_COPY_AND_ASSIGN(FileModuleProvider);
};

} // namespace gin

#endif // GIN_MODULES_FILE_MODULE_PROVIDER_H_
